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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96e79eeee50ed767206ca297c4f8c888827b4e4446cb78be6492887924a3a53' 
  AND token = 'wR8hCuGdZgl9jz7bfncB8TN3nCtWDcERdtGWI4/TEV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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