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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e880405718dd961141a283402f35f544b2c527af6353db13e8b7607907dc8d5' 
  AND token = 'VSX79SKWNkJJY/d2cK+iwdUhZO7NUlVPU7C2X8iYIcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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