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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a76fad5b7006c090c9feb9cf4510680d2c1579451d3bb9ba3dd95ecf70d2150' 
  AND token = 'uFPf3/lW12yFUz3ur/9mBJUyrxTdIWMaFw95Kb7WpTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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