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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1797bb808fbd98a9526159910c829ee09aedc5b4eaa5b4660f5c5c9ddd93c5d' 
  AND token = 'o3Yfgr6sTz6Z1rdFo23IHm+x7/f17tdTczDNGCBbiXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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