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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3111ff7caf10372d4b86c2c95f06f1ea426e85dd2dd377d103b6849e91a7c39' 
  AND token = 'XEN+s+WTo60icYSHrT4aV5jQ9WhhWAMRvz7w1YT2HW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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