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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d7d7b2c0aa399df3e4599bd8952e79988656f0d32648979db486497d8e9d0b' 
  AND token = 'Gv8mLUJQFfAlS3ELT/W6IMsqG4EH4NrM3M2V4qmxqkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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