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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97296b271f9d644af4b083007fa0c7e9e6f49f050c67df9ee523c40082f1251c' 
  AND token = '9m582M+xLidFJK7C+duOOu/mji+9nhPeb1a90ABe/5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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