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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd882e1b67c0f485a19f25409d34415c1973ca09846276a17c126d4cbc9856d84' 
  AND token = '0jMvm0nZRQqJ2TrTRs2nCFon/V4pagYRVab4HwCqrl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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