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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d14b716aedff99ec35594b2838e27e0e0aa9310ea9dcabe53fc6a4db8297ae' 
  AND token = 'T8T/u2Jld9wc7wcbzlIIyhpnXGzOGJsAHhxjBl9RPKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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