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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264eb35d3d463139a657890d2a7b55b794cead5e1787083c9e98c85b92afb2ee' 
  AND token = '+kYgrU6tVCKX/+DX968TabRW8030HzxN1g+fWjniXig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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