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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629385482fff80da034feefb291d3f3f282dbf36dd46a2bdd7efd7f17696279d' 
  AND token = '3qVvuKmjl1uvxKftMSt9v4yJCa9ujH2Fe0Y3wDyf3DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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