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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2392f869d2b701b45da7cd2547f84b02984e7634063159e2214bbf7dafc4cd87' 
  AND token = 'CjpAgmY2T5av5MVdGh0zr3G3hTnVxra7fuvefy+6hB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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