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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d1f4f476f768db2f58bfe20b16d3ef4bb90ba07ffe5b784e34d572d7e56c8f' 
  AND token = 'jvL2s80A2pvXB8K1Xknr6zgeqGQ5elXvwzGMAOed3h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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