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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8b0a4ff40959271c836f461d0d4b3661972979df64bec5a4509a7f6ffc8ccc' 
  AND token = 'HWinNeMhWbvOGOjQl88Vc9KCiJ1GaPDM19lRfknh+lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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