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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc916d621300be23164fa283f282a5815767a7ca884d07f3078ebcb3a3849f2' 
  AND token = 'HWl1fQkDB9XsJaE8oimSj+VU4y9Ods1is4Zz/jqWWzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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