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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85d817bd2a1488d98f53d1c516c78ec57e77bab9cf4cf0ad579d5418a071e98' 
  AND token = '26CMr3JkfKB3JYsureSlwFCsMuvi0OCH8apXfU2EMwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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