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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6902887be10a2f87b7d1b9c548ec2b06bc3898c756b19aae5503b99a47332a' 
  AND token = '0wLnK4i5WNxiQK2lpQCPfyj+tqAYdtNGVehRmtSq4cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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