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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df765b5fcb5312b2931a56c7963008d0c41c66bfb39998ec41e3d0cd33aba4ce' 
  AND token = 'fPtKTTiqFuIX4eZR/1LyOyhhj4pF6ym62a5+D+Be99A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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