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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a79514db9bd5cea0aa587c1fe1d3cd9dee073b291070dcc2349f37bb92e8ee' 
  AND token = 'mlwV0jjdnhC+6bRaTN35sKPfGsQRR5wVxdplTZfiT/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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