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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76227f5a02887be5e49f8abb8c6f96de7ae08063eb8417af61827a93a59d92b9' 
  AND token = 'HLggC6fQYhrMqOzZQs/3PxUeUHattSoLyfCTueSSNDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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