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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b58544a0033e1e0f1a2035a14576e3da0c0fd810e39ab204dc82d58202245b' 
  AND token = 'R3Nf/a7yAm8lqeYjzu5smF5MqULFS5UzG6O57JdqHeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}