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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237d337b96779f12814c94570829ff28104d0e7a3c913a6154d9c60435cb3da1' 
  AND token = 'Mvs6XXWjvcsKxRVODps9fU0+RunoZOGr7MFb0UOoQ7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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