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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700fdf41d001a18d37d9289f4d4e23da9c72a95743c5fd494596a50f1f0909c0' 
  AND token = 'hd8v8K4T3pz5EEBFFarikrDkEO4s6GGjectbutBF4Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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