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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf1cf626a58a35d19493f1ab8db57a84f5dcace55f84ed505e7e1741c007893' 
  AND token = '6gTt34Fe75XTi09fv0gkzPVO8nTYvAIktZpPprxEHZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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