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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af86a44c64779d091b1f4c9d3da0909d854c9443098cc12b0343e9e54377da9a' 
  AND token = 'DHhkHLzeJdS/VXqwrccZAOnMo3Vn6ao8TILmC3iiaWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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