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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8230dada9d4bc509b06da4c6e1e91a9d20351691a9171a36fc191862e217380' 
  AND token = 'n2OUdQEpw6N15u6nWIeJ3hDO6r7G1nID5R2oPRj2lmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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