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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27f783a1ba98083e74d249668c9dc7f9f7280ce487b61cd8cf8b8ad51dd69d3' 
  AND token = 'VhHBhkEiTGhC/jwU0P6nE8A7r8uiw0Hq43zrYnFMvp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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