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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947c4de7ac30594b22db047903d3153c18a18740161ac3cbe401bcbcf9056ff6' 
  AND token = 'j6PXzCJrKNwRAI4XpmDlao1W00UN8ul3RBlGCsfoxKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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