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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902127d3d4461cb6ab8578ecc3a97b72df7ee9bc8d4be242fd4f82bbf961bb64' 
  AND token = 'FXanQl02HJc5Hb1XH7RMQDuFO9nZu25vt42/YLdKqYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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