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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d7ebc518a71db458f6b2e45a93c9794cbd0ec2ac7d76b7c61529d7311030b0' 
  AND token = 'PybsNIy80rzwIxllseptEICTZNPcwaQ9ztAA8Tv39ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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