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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c984550b27bfacf91b6cdb4294cb5e91e9fe4236fc6525f6a021d84f9ba5d46f' 
  AND token = '1fNyTAuY0vECyDiPRREF/3L1AdvOlXcgyyB41k97dJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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