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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c86f1505d7b734cfb5025969e1b9687f1264a4572d0099fbca285f7add6308' 
  AND token = 'y7zwXFuBWVna+D7T98vE4Cf2NQJWg3zIiby4N7eNtK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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