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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3796fbbcf9cab9bd0a84884ad63282121f5aee26cd53e7ed65fccebfb81b80ba' 
  AND token = 'tMxfVPeLmXXf3EPxWZtypbcGAGUG7ax8k/M0GIH5WXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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