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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fe1dd44a5dc9dd8a9eea251b7c784bc7fe1a566367d3c06ff6eb794641650c' 
  AND token = 'k5VpjJbdeR5mPupp8EEIm8/aEE6YuUJNAT7uKRIp0Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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