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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0608c42ba3e3ca4cf63590a530bcca0f81b7a5c964e21e3de59762e92477feed' 
  AND token = '+uLFCNSeLk0avEKXguoNidy5YdrZlqFT2Zvonhyd+tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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