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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add5c7276ed3c2c03bc349bb2d59cf441242040d9d6d809e526c9ab4271df296' 
  AND token = 'jZv7TSMYSuaCcOOeytv8zAjBtS/HVwUIeg/OqXoxFfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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