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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877d74efcb42afe83bb2b793624a561339e64799d89db141586e8746fd7c16b8' 
  AND token = '12F/ugp1IrRhmIdwTtv1tbcb8T1Cl5gHi6E0uhiOibE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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