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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc26c38596d2fa853d00c3fe9e80b95868034240fc25bf55187aef24269a3b7' 
  AND token = 'Pc4TgYHnZ50/fG00yfoiqIqC3Bqtdd7qmP0umUrWofA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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