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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67090c43a56384b0d486ed4efb5c289c0b0f68aae948b11dea26fb8daff2415' 
  AND token = '9KHNMAQfpEbDreA6JOmc3ARGz1exS4gw6a/lrVnS4kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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