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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99a82e20724fe8b96cce35dca747f6e4ea75f095306b0c73cb6cbb9b3df6fa2' 
  AND token = '6samaqEIVwbV/ofvVnvs8axem1zgqTQLrK6H/LwLt2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

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