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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713e32c6b19018a2f6f72bdcd2ba47a1e89ee4e323cf450a03045df9621e7485' 
  AND token = 'a779s9UxL1rCbqLZxtYXndZQTMdhOT0JXezR7pOHYm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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