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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e5dc6b4eed1c69e9331016292bf3374d26b2a66ad6f7086b5e7f83b59d5a7c' 
  AND token = 'FI++tSq160D4zWvxIFMCH1zLJW/fSnw9FrUGL7yms7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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