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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262eec28dccd5f203d24dc84d5cae4931f90758b755030560feee56a0de6a6ad' 
  AND token = '/Buc4A/E9E/dyzViIG3PwrpJIMFpKm5ktuRu70aW3zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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