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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68198b9dee4ad51561664b72ea8d76be3618c5d140d416aa15a3e22f8e5c7e91' 
  AND token = 'cJ271CjGuV0nv9aadip1rKqyx05YN6EPGHfhG0KpLxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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