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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f2c44a347992d23b4dd64e66ddc56771e13335dcbe715323c2976da88ffc78' 
  AND token = 'IG13V2ho22vSvVPbP4Al2dSyjdWINQOzNkt+FqVQkCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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