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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638e8f43f5aa6f744e2c41372f47d2ab175f1770681d5971800d964fe25e8a67' 
  AND token = '3Tdkeknrerc0pLYRLgoI/cVifkStwWryJoyWn/ITi3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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