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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb38fe2317a893c25f990815522e7e8bbc4f208f7eb70f6b5aee0bd562fbe7a0' 
  AND token = 'YHtPsXuoKRmzCxx3Xnj8v4TtG1xISVRFLE3/4Hnv7d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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