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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64775fef4aeb0f7f30873c15ccc27a7d4bfec0b9eef9ee1e8a8f33891854b4e6' 
  AND token = 'e4cyLV+3quGzjg5Z9/lB2HpH7pgriT1MlwbSXXaAZSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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