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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828c12f11dc66a039cd0d7cc5e202ec755f663a00abd77a3621cf662b366bb58' 
  AND token = 'xPENv90x0OeSs1cnkY/1uvjBr8JX0+hhR3emyX8AU+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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