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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd43fbfa353b375a2548f5ad02af938742a5333af09d4e771eeabbf8dc017b1' 
  AND token = 'NY6jhUSojqugDeqV2fABERm5TnQaLeZAHdT0DFQXhEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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