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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84322ad3ee925e42a39673007936cccd0794c74304eb0f8c6f5b66ed3a9ad9fe' 
  AND token = 'rBJnuTrjw9Q6PZepTu/3+mSv2vxWJDqXgEgtNEll9cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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