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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5045eff01e635ccc7634f8221bd5a9132df62a0944ad252be1244ee6fcb063f9' 
  AND token = 'HSV5Qc5BPrez6M6vo7CA5jRfLdw0rSh+83J08jA0xCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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