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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334d040a3ed75d88b91940737faef237dd2857421d774d46139bf50c3ad17c57' 
  AND token = 'Gyu1n+Dw9N3eYfP3M0ue/LIPQFVgJs4M1KKxBV/n6+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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