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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879739f6a42c0129e2e7eba5a4f827476a7d94e1e7af70e0bc1fdaec6c9fd8ae' 
  AND token = 'LZWVXsz7YzDK9kSv0m+i+nFku94v3nmT27ljGhiV3Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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