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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9e82a16039f5db99b01c0edce2ac206e57218c1716f7d190128e82809cc1cf' 
  AND token = '2ilARnmQrTZzjRiRcBagGCTNBSXVlE50XcwYl/YXERw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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