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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7365c550f554be361ab052864014cb418aadd8170341758e62ce97f7d888d548' 
  AND token = 'YbFUDtg4m8grw5PK43FbC97S1bLHW9QJhbTzQW7XFdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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