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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815adb7ef412dc2d2b86ce3677e5707d23abdffe2e3ef64234828336a2886c5a' 
  AND token = 'MHaxQmm6rX1tALonjfyWBRJtUlxzKKK9PB9YE4rkwm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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