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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b071d0665a6e7d8fa65b131d44f25ede4fcd40252b8a4001386844bdbca5d68' 
  AND token = 'xIkRDtRaFygokcxHlPNO2YBUWZBLMrhag5yk0+ZVNLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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