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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd557850be899de2907db87c5a5457593c6059c50cdd7231daf45303a9c3e0d' 
  AND token = '85RMDq039dNIQ86GUvvryZxUvrUHIKFAH1pN+8lO4PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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